Open ~/.bash_profile in your favorite editor and add the following content to the bottom.
# Git branch in prompt.
parse_git_branch() {| import { useRef, useEffect } from 'react'; | |
| /** | |
| * a type-safe version of the `usePrevious` hook described here: | |
| * @see {@link https://reactjs.org/docs/hooks-faq.html#how-to-get-the-previous-props-or-state} | |
| */ | |
| export function usePrevious<T>( | |
| value: T, | |
| ): ReturnType<typeof useRef<T>>['current'] { | |
| const ref = useRef<T>(); |